Charles a



(No Model.) 4

C; A.A SMYTI-L v SECUNDARY BATTERY.. Y

No. 292,142. PatentedJan-.j15, 1884;

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UMTED STATES.'

PATENT Urraca..

CHARLES A. 'SMYTIL ornoornsron, ILLrNoisAssiGN-on oF oNnHALF To HAMER r. BROWN, or SAME PLACE.

lSECONDARY BATTERY.

EPF- CIIEICACLIONl forming part of Letters Patent No. 292,142, dated January 15, 1884.

' Application filed March 7, 1883. (No model.)

To @ZZ whom,V it may concern:

Be it known that I, CHARLES A. SMYTH, a citizen of the United States, residing at Hoopeston, in the county of Vermillion and State of Illinois, have invented certain new and useful Improvements in Secondary Batteries;

and I do declare that the following to be a full, clear, and exact description of the inveny tion, such as will enable others skilled in the art to which it appertains to make and use the same, reference beinghad to the accompanying drawings, and to the letters and `figures of reference marked thereon, which form a part of this specification.

My invention relates to Secondary or storage batteries for electrical machines or devices; and the novelty consists inthe construction, arrangement, treatment, and adaptation of parts, as will be more fully hereinafter set forth, and specically pointed out in the claims.

The object of the invention is to provide a secondary or storage battery which shall present a maximum surface of oxidized lead to the action of dilute sulphuric acid, as accumulators for the electricity 5 and the invention consists, essentially, in the devices illustrated' in the accompanying drawings, which form a part of this specification, and in.which- Figure 1 is a vertical section of the battery in position; Fig. 2, 'a detail perspective view of one of the removable accuinulators, and Fig. 3 an enlarged detail of one of the lead shot.

The object which is Sought to be attained by this invention-that is to say, the multiplication of lead surface in secondary batteries-has been attempted in various and numerous ways-such as the employment of lead plates and balls in the sulphuric-acid bath.

Referring to the drawings, in which similar letters of reference indicate like parts in all the figures, A represents the box or vessel which is adapted to hold the sulphuric acid which forms the battery, and it is provided with a' lining of corrugated sheet lead, a., which serves to protect the vessel A from the corro- B represents a-rectangular box of Vcorru4` gated sheet-lead, having open top b, as shown. 5o These boxes B are of length slightly less than the space within .the walls of the vessel A, in which they are to be suspended, in order that the dilute sulphuric acid-of the battery may act upon every side, and the sides, ends, and bottom of each ofthese boxes B are provided with alternating slits b, to allow the free circulation of the acid throughout. These boxes B, which, for convenience, Iwill designate as accumulators, are narrow compared with Co their length and depth, so that two or more may be suspended in each battery, vessel, or cell. l

In Fig.- 3 I illustra-te, upon an enlarged scale, one of my shots D. 4 Each shot of lead is 65 l provided with a hole, cl, extending through it at or nearits center, and it may also be provided with a similar hole at right angles thereto. These perfor-ations greatly increase the accumulating-surface of the shot, and add 7o' greatly to the efficiency of the device. The v shot are arranged in the perforated boxes B, so that the sulphuric acid may freely circulate through and between them,'so as to receiv the action of the extended lead surface thus provided.

Before arranging the battery for service the accumulators, consisting of the boxes B and shot, arc subjectedrto a bath of nitric acid and' water to oxidize the surfaces; and, of course, 8o the longer such surfaces are exposed to the action of said bath the deeper the oxidation.

The spaces within and around the' balls may be lled with white lead, mixed with sulphuric acid and water, whereby I secure v almost a solid block of spongy lead, which is adapted to store electrical energy, whereby the storage capacity of the battery is increased. When it is desired toV arrange the battery for service, the previously oxidizedelectrodes B and I), treated as described, are suspended by any proper means in the sulphuric acid of the battery-vessel A, and the wires of the dynamo E applied. p I do not desire, in this application, to broadly 95 cover the system of increasing the lead surface in secondary batteries, and such claim is not made; but

Vhat I do claim is A slits b', and shot D having perforations d pre- 1. In a secondary or storage battery, the viously oxidized in a bath of nitric acid, the combination of the vessel A, having the Corballs being filled with white lead mixed with rugated sheet-lead lining a, the boxes B, havsulphuric acid and Water, the whole arranged 15 5 ing slits b', and shot D, having perforations l as and for the purposes set forth.

previously oxidized in a bath of nitric acid, In testinionywhereof I affix my signature in the Whole arranged as and for the purposes l presence of two Witnesses. set forth.

2. In a secondary or storage battery, thei Vv'itnesses:

1o combination of the vessel A, having the corrugated sheet-lead lining a, the boxes B, having CHARLES A. SMYTH.

H. M. STEELY, DAvID BEDELL. 

